1 /* 2 * Copyright (c) 1996, 1997, 1998 3 * HD Associates, Inc. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by HD Associates, Inc 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD: src/sys/posix4/p1003_1b.c,v 1.5.2.2 2003/03/25 06:13:35 rwatson Exp $ 33 * $DragonFly: src/sys/kern/kern_p1003_1b.c,v 1.7 2003/11/27 19:11:17 dillon Exp $ 34 */ 35 36 /* p1003_1b: Real Time common code. 37 */ 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/kernel.h> 42 #include <sys/sysent.h> 43 #include <sys/proc.h> 44 #include <sys/syslog.h> 45 #include <sys/module.h> 46 #include <sys/sysproto.h> 47 #include <sys/sysctl.h> 48 49 #include "posix4.h" 50 51 MALLOC_DEFINE(M_P31B, "p1003.1b", "Posix 1003.1B"); 52 53 /* p31b_proc: Return a proc struct corresponding to a pid to operate on. 54 * 55 * Enforce permission policy. 56 * 57 * The policy is the same as for sending signals except there 58 * is no notion of process groups. 59 * 60 * pid == 0 means my process. 61 * 62 * This is disabled until I've got a permission gate in again: 63 * only root can do this. 64 */ 65 66 #if 0 67 /* 68 * This is stolen from CANSIGNAL in kern_sig: 69 * 70 * Can process p, with pcred pc, do "write flavor" operations to process q? 71 */ 72 #define CAN_AFFECT(p, cr, q) \ 73 ((cr)->cr_uid == 0 || \ 74 (cr)->cr_ruid == (q)->p_ucred->cr_ruid || \ 75 (cr)->cr_uid == (q)->p_ucred->cr_ruid || \ 76 (cr)->cr_ruid == (q)->p_ucred->cr_uid || \ 77 (cr)->cr_uid == (q)->p_ucred->cr_uid) 78 #else 79 #define CAN_AFFECT(p, cr, q) ((cr)->cr_uid == 0) 80 #endif 81 82 /* 83 * p31b_proc: Look up a proc from a PID. If proc is 0 it is 84 * my own proc. 85 */ 86 int p31b_proc(struct proc *p, pid_t pid, struct proc **pp) 87 { 88 int ret = 0; 89 struct proc *other_proc = 0; 90 91 if (pid == 0) 92 other_proc = p; 93 else 94 other_proc = pfind(pid); 95 96 if (other_proc) 97 { 98 /* Enforce permission policy. 99 */ 100 if (CAN_AFFECT(p, p->p_ucred, other_proc)) 101 *pp = other_proc; 102 else 103 ret = EPERM; 104 } 105 else 106 ret = ESRCH; 107 108 return ret; 109 } 110 111 112 #if !defined(_KPOSIX_PRIORITY_SCHEDULING) 113 114 int syscall_not_present(const char *s); 115 116 /* The system calls return ENOSYS if an entry is called that is 117 * not run-time supported. I am also logging since some programs 118 * start to use this when they shouldn't. That will be removed if annoying. 119 */ 120 int syscall_not_present(const char *s) 121 { 122 struct proc *p = curproc; 123 log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n", 124 p->p_comm, p->p_pid, s); 125 126 /* a " return nosys(p, uap); " here causes a core dump. 127 */ 128 129 return ENOSYS; 130 } 131 132 /* Not configured but loadable via a module: 133 */ 134 135 static int sched_attach(void) 136 { 137 return 0; 138 } 139 140 #define SYSCALL_NOT_PRESENT_GEN(SC) \ 141 int SC (struct SC##_args *uap) \ 142 { \ 143 return syscall_not_present(#SC); \ 144 } 145 146 SYSCALL_NOT_PRESENT_GEN(sched_setparam) 147 SYSCALL_NOT_PRESENT_GEN(sched_getparam) 148 SYSCALL_NOT_PRESENT_GEN(sched_setscheduler) 149 SYSCALL_NOT_PRESENT_GEN(sched_getscheduler) 150 SYSCALL_NOT_PRESENT_GEN(sched_yield) 151 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max) 152 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min) 153 SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval) 154 155 #else 156 157 /* Configured in kernel version: 158 */ 159 static struct ksched *ksched; 160 161 static int sched_attach(void) 162 { 163 int ret = ksched_attach(&ksched); 164 165 if (ret == 0) 166 p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 1); 167 168 return ret; 169 } 170 171 int 172 sched_setparam(struct sched_setparam_args *uap) 173 { 174 struct proc *p = curproc; 175 int e; 176 177 struct sched_param sched_param; 178 copyin(uap->param, &sched_param, sizeof(sched_param)); 179 180 if ((e = p31b_proc(p, uap->pid, &p)) == 0) { 181 e = ksched_setparam(&uap->sysmsg_result, ksched, p, 182 (const struct sched_param *)&sched_param); 183 } 184 return e; 185 } 186 187 int 188 sched_getparam(struct sched_getparam_args *uap) 189 { 190 struct proc *p = curproc; 191 struct proc *targetp; 192 struct sched_param sched_param; 193 int e; 194 195 if (uap->pid != 0 && uap->pid != p->p_pid) { 196 e = p31b_proc(p, uap->pid, &targetp); 197 if (e) 198 return e; 199 } else { 200 targetp = p; 201 } 202 203 e = ksched_getparam(&uap->sysmsg_result, ksched, targetp, &sched_param); 204 205 if (!e) 206 copyout(&sched_param, uap->param, sizeof(sched_param)); 207 208 return e; 209 } 210 211 int 212 sched_setscheduler(struct sched_setscheduler_args *uap) 213 { 214 struct proc *p = curproc; 215 int e; 216 217 struct sched_param sched_param; 218 copyin(uap->param, &sched_param, sizeof(sched_param)); 219 220 if ((e = p31b_proc(p, uap->pid, &p)) == 0) { 221 e = ksched_setscheduler(&uap->sysmsg_result, ksched, p, 222 uap->policy, (const struct sched_param *)&sched_param); 223 } 224 return e; 225 } 226 227 int 228 sched_getscheduler(struct sched_getscheduler_args *uap) 229 { 230 struct proc *p = curproc; 231 struct proc *targetp; 232 int e; 233 234 if (uap->pid != 0 && uap->pid != p->p_pid) { 235 e = p31b_proc(p, uap->pid, &targetp); 236 if (e) 237 return e; 238 } else { 239 targetp = p; 240 } 241 242 e = ksched_getscheduler(&uap->sysmsg_result, ksched, targetp); 243 244 return e; 245 } 246 247 int 248 sched_yield(struct sched_yield_args *uap) 249 { 250 return ksched_yield(&uap->sysmsg_result, ksched); 251 } 252 253 int 254 sched_get_priority_max(struct sched_get_priority_max_args *uap) 255 { 256 return ksched_get_priority_max(&uap->sysmsg_result, ksched, uap->policy); 257 } 258 259 int 260 sched_get_priority_min(struct sched_get_priority_min_args *uap) 261 { 262 return ksched_get_priority_min(&uap->sysmsg_result, ksched, uap->policy); 263 } 264 265 int 266 sched_rr_get_interval(struct sched_rr_get_interval_args *uap) 267 { 268 int e; 269 struct proc *p = curproc; 270 271 if ((e = p31b_proc(p, uap->pid, &p)) == 0) { 272 e = ksched_rr_get_interval(&uap->sysmsg_result, ksched, 273 p, uap->interval); 274 } 275 return e; 276 } 277 278 #endif 279 280 static void p31binit(void *notused) 281 { 282 (void) sched_attach(); 283 p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE); 284 } 285 286 SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL); 287